A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

What word begins and ends with an E, but has only one letter?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Using eight eights and addition only, can you make 1000?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

By moving just one matchstick, you need to make the below statement true. Can you do it?